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CVE-2026-15340

Critical9.3

lwIP SMTP client does not check the size of inputs, potentially allowing a buffer overflow.

CVSS
9.3v4.0
EPSS (exploit probability)
0.6%48th pct
CISA KEV
Not listed

EPSS trendFIRST daily scores, last 90 days

FIRST EPSS held steady from 0.6% on 2026-10-10 to 0.6% on 2026-10-20, ranging 0.6%–0.6% across 10 daily scores.
2026-10-10 → 2026-10-20 · 10 days · 0.6%–0.6%
Daily values
FIRST EPSS daily scores for this CVE
Score dateEPSSPercentile
2026-10-200.6%47.7%
2026-10-190.6%47.6%
2026-10-180.6%47.5%
2026-10-160.6%47.5%
2026-10-150.6%47.5%
2026-10-140.6%47.4%
2026-10-130.6%47.2%
2026-10-120.6%47.1%
2026-10-110.6%47.1%
2026-10-100.6%47.1%

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Coverage1 article

References

Facts sourced from NVD, FIRST EPSS, and CISA KEV. Last synced 2026-10-21 07:34 UTC.

  • CVSS & description: NVD 2.0, fetched 2026-10-21 05:34 UTC
  • EPSS: FIRST EPSS, fetched 2026-10-21 07:34 UTC; score date 2026-10-20
  • KEV: CISA KEV, fetched 2026-10-21 07:34 UTC
CVE-2026-15340 | SecurityTabs